JPH08118203A - Control method of nc lathe and device thereof - Google Patents

Abstract

PURPOSE: To find out a tool set data for each main spindle by a very simple method. CONSTITUTION: A set error of tools 22A1-22A4 on a cutter stand 17A for a reference main spindle 12A is obtained by finding out the correction value of other tools 22A2-22A4 from a standard tool 22A1 for the reference main spindle 12A. The set error of the tools 22A1-22A4 on the cutter stand 17A of a second main spindle 12B other than the reference main spindle 12A is obtained by adding the correction value of the main spindle distance for the reference main spindle 12A to the set error of the tools 22A1-22A4 for the reference main spindle 12A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method and a control device for an NC lathe having a plurality of spindles.

[0002]

2. Description of the Related Art Conventionally, a multi-spindle automatic lathe has been well known as a lathe that allows a plurality of spindles to grip a workpiece and simultaneously perform different processes simultaneously to obtain high productivity.
This multi-axis automatic lathe is also stipulated in Japanese Industrial Standards (JIS), and JIS B0105-1977.
It is well known as defined in FIG. 3 (hereinafter, known example 1) attached to page 4 and page 24 of “Terminology for name of machine tool”.

In the multi-spindle automatic lathe of the known example 1, it is usually 4
It has a main shaft to be index-rotated to eight axes, and is equipped with a tool rest that is movable relative to the position of each main shaft to be index-rotated. Then, the steps required for machining one work are distributed to each indexed spindle and the tool rest, and multiple steps are simultaneously executed while indexing the spindle. That is, machining of one work is completed every time the spindle is indexed.

An automatic lathe which achieves high productivity, for example, by having a plurality of spindles grip the workpieces respectively and simultaneously performing the same process on all the spindles without indexing the spindles, is disclosed in, for example, Japanese Utility Model Publication No. 51-10462. The one disclosed in Japanese Patent Publication (hereinafter referred to as the known example 2) has been proposed. This automatic lathe is a single tool that is movable in the Z-axis direction parallel to the center line of the spindle and the X-axis and Y-axis directions orthogonal to the Z-axis, with respect to the spindles provided in parallel with each other. A pedestal is provided, and a plurality of turrets (three in each embodiment) facing each spindle are provided.
Tools). Therefore, 6 sets of tools facing the 6 spindles move in unison in accordance with the movement of the tool post, and the same machining process is simultaneously executed for all the spindles, thereby finishing machining of 6 workpieces at a time. .

FIG. 6 shows another prior art structure having two main axes parallel to each other (hereinafter, referred to as a known example 3). A headstock 2A, 2B (headstock 2A is not shown) is provided on the bed 1 so as to be movable in the Z-axis direction parallel to the centerline of the headstock, and is rotatably supported by the headstock 2A, 2B. A column 3 is integrally provided with the bed 1 in front of each main shaft, and the column 3 is provided with guide bushes 4A and 4B on the center line of each main shaft. Further, one tool rest 5 is provided on the column 3 so as to be movable in two X-axis and Y-axis directions orthogonal to the Z-axis direction. A plurality of turrets 5 are arranged in a comb-like shape with respect to each of the guide bushes 4A and 4B (each 4 in the drawing).
Tools 6A, 6B, 6C, 6D are provided at equal intervals with the guide bushes 4A, 4B, respectively.

Here, the work 7A, which is held by the two main shafts 2A and 2B and supported by the guide bushes 4A and 4B,
7B are simultaneously machined by corresponding tools (for example, 6C and 6C), and the same process is simultaneously performed on two spindles, so that two workpieces 7A and 7B can be processed at a time.
Processing ends.

[0007]

The multi-spindle automatic lathe according to the known example 1 is limited to mass-produced parts because the machine is extremely complicated and large and the operation and setup are difficult, as shown in Appendix 3 of JISB0105. And used. Further, in order to make this numerical control (NC), an extremely large number of control axes are required. Therefore, it can be said that there are very few NCs that have been put to practical use.

On the other hand, in the automatic lathes shown in the known examples 2 and 3, since the same process of the same work must be processed by a plurality of tools at the same time, the relationship between the spindle and the tools is the same for all the spindles. Tooling has to be done so that tooling is very difficult. Also NC
Even if the tool is changed, independent tool compensation is not possible for each tool, so tooling is still very difficult.

Therefore, in order to solve the above-mentioned prior art, the applicant of the present application has a plurality of main shafts having mutually parallel main shaft center lines and provided at a predetermined interval, and the plurality of main shafts. A plurality of headstocks that rotatably support the spindles independently of each other, and an X-axis direction orthogonal to the Z-axis direction parallel to the spindle axis and a plurality of spindle centerlines orthogonal to the X-axis direction. At least one tool rest that is movable in the Y-axis direction and has a plurality of tools that are connected so as to be orthogonal to each other, and the headstock and the tool rest are relatively close to each other in the Z-axis direction. An axial feed means for moving the tool rest so that the tool rest moves in a direction parallel to the Y-axis direction to move the work piece gripped by the plurality of spindles to the tool rest. Selective positioning of any held tool In ability to develop a NC lathe is numerically controlled by a coordinate system along the XY axis, a patent pending.

As a result, a highly productive NC lathe having a plurality of spindles, which can be downsized with a simple structure and which can be operated, set up, and tooled in exactly the same way as an ordinary single-spindle lathe, can be obtained. It was

By the way, in such an NC lathe, at least one tool post having a plurality of tools is moved to each of a plurality of spindles for machining, so that one tool post for each spindle. It is necessary to obtain the tool set data for each of the plurality of tools. In this case, if a plurality of tools of one tool post are moved with respect to each spindle and the tool set data is obtained, an extremely large number of work steps are required. Although it is not directly related to the control method of the present invention, a related technique is, for example, Japanese Patent Publication No. 6-49263.
Publication.

An object of the present invention is NC which can obtain tool set data for each spindle in a very simple manner.
It is to provide a control method and a control device for a lathe.

[0013]

A first method of the present invention for achieving the above object is to provide a plurality of spindles having spindles parallel to each other and spaced at a predetermined interval. A plurality of headstocks that rotatably support the plurality of spindles independently of each other, an X-axis direction orthogonal to a Z-axis direction parallel to the spindle centerline, and a plurality of the spindleheads orthogonal to the X-axis direction. At least one tool rest that is movable in the Y-axis direction and has a plurality of tools that are connected so as to be orthogonal to each of the spindle centerlines; and that the headstock and the tool rest are the Z-axis. And a tool for moving the workpiece held by the plurality of spindles by moving the tool rest in a direction parallel to the Y-axis direction. Select any tool held on the turret in position An NC lathe that is positionable and is numerically controlled by a coordinate system along the XY axis directions, wherein one of the plurality of spindles is set as a reference spindle, and each spindle from a reference position of the reference spindle is set. The distance of the reference position is set, and one of the plurality of tools of the tool rest is set as a standard tool, and the cutting edge of this standard tool is moved from the reference position of the reference spindle to the reference position of each spindle. , Read the movement amount at that time, determine the difference between the set distance of the reference position of each spindle from the reference position of the reference spindle and the movement amount of the standard tool from the reference spindle to each spindle, and the spindle distance for each spindle As the correction value of the main spindle distance and the correction value of the error of the set of the tool attached to the tool rest relative to the reference main spindle to obtain the correction value of the set error of the tool with respect to the main spindle other than the reference main spindle. Characterized by

A second method of the present invention for attaining the above object is to calculate a correction value for a set error of a tool with respect to a spindle other than the reference spindle by the absolute value based on coordinates in the first method. Characterize.

The apparatus of the present invention for achieving the above object has a plurality of main shafts having mutually parallel main shaft center lines and provided at a predetermined interval, and each of the plurality of main shafts. A plurality of headstocks that are independently rotatably supported, and an X-axis direction that is orthogonal to the Z-axis direction parallel to the spindle centerline, and a plurality of spindle centerlines that are orthogonal to the X-axis direction and are orthogonal to the X-axis direction. At least one tool rest which is connected so as to be orthogonal to each other and is movable in the Y-axis direction and which has a plurality of tools, and the headstock and the tool rest are relatively close to and separated from each other in the Z-axis direction. And a tool for moving the tool in a direction parallel to the Y-axis direction, so that the tool rest is held by the tool rest at the machining position of the work held by the plurality of spindles. XY can be used to selectively position any tool An NC lathe numerically controlled by a coordinate system along a direction, wherein one of the plurality of spindles is set as a reference spindle, and reference positions of the plurality of spindles from a reference position of the reference spindle are set. A spindle distance data storage unit that stores distances in the XY directions and one of a plurality of tools of the tool post are defined as standard tools, and the cutting edge of the standard tool is determined from the reference position of the reference spindle to each of the spindles. A tool rest movement amount data storage unit that stores a movement amount when moved to a reference position, a distance of a reference position of each spindle from a reference position of the reference spindle stored in the spindle distance data storage unit, and Spindle distance correction data storage unit that stores the difference between the movement amount during standard tool movement from the reference spindle to each spindle stored in the turret movement amount data storage unit, and the cutting edges of a plurality of tools of the turret Distance from the cutting edge of the standard tool And a tool set setting data storage unit for setting, and stores the movement amount when the cutting edge of the standard tool is adjusted to the reference position of the reference spindle and the cutting edge of each tool from there is moved to the reference position of the reference spindle. A tool set data storage unit, a difference between the data stored in the tool set setting data storage unit and the data stored in the tool set data storage unit is obtained for each tool and stored as tool set correction data for the reference spindle. Further, the sum of the data stored in the spindle distance correction data storage unit and the data about the reference spindle stored in the tool set correction data storage unit is stored as a correction value of a tool set error with respect to a spindle other than the reference spindle. The tool set correction data storage unit, the spindle correction value stored in the spindle distance correction data storage unit, and the tool set correction data storage unit. And a correction data calculation unit for calculating a correction value for the set error of the stored tool.

[0016]

The tool set data for the tool post relative to the reference spindle can be obtained by obtaining the correction value of the other tool from the standard tool for the reference spindle. The tool set data of the tool post of the spindle other than the reference spindle is obtained by adding the correction value of the spindle distance to the reference spindle to the tool set data for the reference spindle. Therefore, when machining a workpiece gripped by the reference spindle with the tool of the tool post, the correction value of the tool set for the reference spindle is read, and the selected tool is compensated for the machining. Similarly, when a workpiece held by another spindle is machined by a tool of a tool post, the correction value of the tool set for the spindle is read out and the selected tool is compensated for machining.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an NC lathe according to the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, in a headstock sliding type lathe for machining a bar material, the head 10 can be slid on the upper surface of the bed 10 in the Z-axis direction parallel to the centerline of the spindle by an axial feed table. Two first and second headstocks 11A,
11B is mounted, and the first and second headstocks 11 are
A and 11B are moved independently of each other by a Z-axis feed motor (not shown). First and second spindles 12A and 12B, which are rotatably supported by the first and second spindle stocks 11A and 11B, respectively, and are independently rotated by a rotation motor (not shown), are parallel to each other with a predetermined gap therebetween. It is provided in. A column 13 is fixed to the bed 10 in front of the first and second main shafts 12A and 12B. The column 13 is provided with first and second guide bushes 14A and 14B at positions concentric with the respective center lines of the first and second spindles 12A and 12B. The works 15A and 15B gripped by 12B are guided by the first and second guide bushes 14A and 14B so as to be slidable in the axial direction.

In the column 13, first and second tool rests 17A are provided on both sides of a line (hereinafter referred to as a reference straight line) 16 intersecting so as to be orthogonal to both the center lines of the first spindle 12A and the second spindle 12B, respectively. 17B is provided. The first and second turrets 17A and 17B are arranged in the Y-axis direction parallel to the reference straight line 16 and with the first guide bush 14A and the second guide bush 14A.
The Y-axis tables 18A and 18B provided on the column 13 slidably in a long stroke so as to be able to face both the guide bushes 14B and slide in the X-axis direction orthogonal to both the Y-axis direction and the Z-axis. Possible Y-axis table 18A, 18
It consists of X-axis tables 19A and 19B provided on B. Then, the Y-axis tables 18A and 18B are moved in the Y-axis direction by the Y-axis feed motors 20A and 20B fixed to the column 13, and the X-axis tables 19A and 18B are moved.
19B is an X fixed to the Y-axis tables 18A and 18B.
It is moved in the X-axis direction by the shaft feed motors 21A and 21B.

Tools 22A1 to 22A4 and 22B1 to 2B2 are provided on the first and second turrets 17A and 17B, respectively.
2B4 are provided in the Y-axis direction at predetermined intervals in the shape of a comb tooth. In addition, in the present embodiment, the tools 22A1 to 22A
The case where A4 and tools 22B1 to 22B4 are outer diameter cutting tools such as cutting tools are shown. Also, the first and second
Movement of headstocks 11A and 11B in the Z-axis direction, first and second
Rotation of spindles 12A and 12B, first and second turrets 17
The movement of A and 17B in the Y-axis direction and the X-axis direction is described in Japanese Patent Laid-Open No.
A multi-system control NC device (not shown) having a control method as shown in Japanese Patent Publication No. 150909 controls in accordance with a program set up for each independent system based on a combination of a headstock and a tool rest determined for each machining process. It

Next, the operation will be described. Work 1 now
For 5A and 15B, the first tool post 1 is first processed.
Cutting with 7A tools 22A1 to 22A4,
After that, as the second machining, the tool 22 of the second turret 17B
A case where cutting is performed by B1 to 22B4 will be described. The tools 22A1 to 22A4 and 22B1 to 2B2
Cutting with the 2B4 outer diameter cutting tool is the first and second
This is performed by rotating the main shafts 12A and 12B.

(A1) First, the first turret 17A
It is positioned so as to face the work 15A gripped by the first main spindle 12A and is moved in the Y-axis direction to move the tool 2
The required one cutting tool from 2A1 to 22A4 is selected. The work 15A is moved by the movement of the first headstock 11A in the Z-axis direction and the movement of the first tool rest 17A in the X-axis direction.
A predetermined cutting process (first process) is performed on the. This cutting process is performed by sequentially selecting one of the necessary cutting tools from the tools 22A1 to 22A4. (A2) When the outer diameter cutting processing (first processing) on the work 15A by the first turret 17A is completed, the first turret 1
7A is moved in the Y-axis direction so as to face the work 15B. Then, the outer diameter cutting process (first process) is performed on the work 15B by the same operation as the cutting operation of (A1). (A3) When the cutting work on the work 15B by the first turret 17A is completed, the first turret 17A is moved in the Y-axis direction so as to face the work 15A again. Then, the work 15A is cut off to separate it as a finished product, and then a new work 15A is supplied. (A4) After that, the operations of (A1), (A2), and (A3) are repeated.

(B1) The second turret 17B is arranged so as to face the workpiece 15A, which has been subjected to the outer diameter cutting, which is the first machining, by the operation (A1) by the first turret 17A. It moves in the opposite direction at the same time as the table 17A, and moves in the Y-axis direction so that a necessary cutting tool among the tools 22B1 to 22B4 is selected. And the second headstock 1
By the movement of 1B in the Z direction and the movement of the second tool rest 17B in the X axis direction, the workpiece 15A is subjected to a predetermined cutting process (second
Processing) is performed. This machining operation is performed by the first turret 17
It is made to proceed at the same time as the cutting work on the work 15B by (A2) by A. (B2) When the cutting work on the work 15A by the second turret 17B is completed, the second turret 17B faces the work 15B, which has been cut by the operation (A2) by the first turret 17A. The first turret 17
Simultaneously with A, it is moved in the Y-axis direction in the opposite direction. Then, the work 15B is cut by the same operation as the cutting operation (B1). This cutting operation is advanced at the same time as the cutting operation of the first tool rest 17A on the work 15A by the above (A3) and (A1).

The above-mentioned first and second turrets 17A, 17
The processing operation by B is as shown in FIG. here,
15A ₁ , 15A ₂ ... are the first of the work 15A,
Shows the _second machining ... 15B ₁ , 15B ₂ ...
Indicates the first, second ... Processing of the work 15B. That is, the first tool rest 17A makes
The outer diameter cutting process which is the process of
In A, the same first machining as outer diameter cutting is performed on the work 15B, and at the same time, second machining is performed on the work 15A by the second turret 17B, and then by the first turret 17A. When the first machining is performed on the workpiece 15A and the second machining operation is performed on the workpiece 15B by the second tool rest 17B alternately, the two first and second spindles 12A and 12B are moved to the first It is possible to obtain extremely high productivity by simultaneously performing the processing of 1 and the second processing.

As described above, the first and second tool rests 17A and 17B are arranged on both sides of the reference straight line 16, respectively.
The second tool rests 17A and 17B are movable in the Y-axis direction parallel to the reference straight line 16 and so as to face the first guide bush 14A and the second guide bush 14B,
And the Y-axis direction and the first and second guide bushes 14A,
14B center line direction (first and second main shafts 12A, 12B
Since it is provided so as to be movable in the X-axis direction orthogonal to the center line direction), the tools 22A1 to 22A of the first tool post 17A are provided.
A4 and the tools 22B1 to 22B4 of the second turret 17B can be respectively distributed according to the purpose. In this case, the rotary drive mechanism of the rotary tool may be provided only on the second tool rest 17B. Further, since the machining of the two works 15A and 15B is performed by the same tools 22A1 to 22A4 and 22B1 to 22B4, the works 15A and 15B are processed.
On the other hand, since different tool offsets can be executed independently, it is easy to adjust the tool when NC is used. Further, the tool setting has only to be performed for one turret with respect to one spindle, and the tool setting can be performed very easily.

In this embodiment, both the first and second turrets 17A and 17B are used for outer diameter cutting, but this can be arbitrarily changed depending on the work. For example, the first turret 17A is used for outer diameter cutting, the second turret 1
Needless to say, 7B may be used for rotary tool processing.
In this case, the X-axis table 19B of the second tool rest 17B is provided with a rotary tool motor for rotationally driving the rotary tool, and the rotary tool machining by the rotary tool is performed by rotating the first spindle 12A and the second spindle. Stop and do. That is, the tools 22A1 to 22A4 of the first turret 17A are provided with cutting tools necessary for a main cutting process including external machining,
The tool of the tool rest 17B can be provided with a rotary tool necessary for the rotary tool process.

In each of the above-described embodiments, different parts can be machined for each spindle such that the work 15A gripped by the spindle 12A processes the part a and the work 15B gripped by the spindle 12B processes the part b. . Specifically, a machining program for the workpiece 15A machined by the spindle 12A,
This can be done by separately storing the machining program for the work 15B to be machined by the spindle 12B in the NC device. Therefore,
Of the tools held on the turrets 17A and 17B, the spindle 12
The tools used for A and the spindle 12B may be different.

Regarding the NC device, at least the following functions are added to the conventional NC device. A program of machine operation for cyclically operating the tool rest of the lathe with respect to the spindle is stored. It has an operation confirmation function for that purpose, and a waiting function between the tool rests (however, this function is known). The machining program that is determined by the combination of the spindle and the turret is stored. This memory may be the case where the spindle 12A and the spindle 12B perform the same machining (normal case) or the case where different machining described in the paragraph number is performed.

Next, a method and a device for calculating the correction values of the tool sets of the tools 22A1 to 22A4 of the first tool rest 17A of the NC lathe having the above-described structure will be described with reference to FIGS. 4 and 5. As shown in FIG. 4, the numerical control device 30 for the NC lathe
Has a control unit 31, and the control unit 31 has a bus line 32.
Via the spindle distance data storage unit 33, turret movement amount data storage unit 34, spindle distance correction data storage unit 35, tool set data storage unit 36, tool set correction data storage unit 3
7, a control memory 38 storing a system program, a correction data calculation unit 39, a display 40, and an input device 41 such as a keyboard are connected.

First, the design values of the distances XS and YS of the first and second spindles 12A and 12B are set in the spindle distance data storage unit 33. The heights of the cutting edges of the tools 22A1 to 22A4 are substantially aligned and attached to the first tool rest 17A, and any one of them is attached.
A book, for example, the tool 22A1 is a standard tool. Further, any one of the first and second spindles 12A and 12B, for example, the first spindle 12A is used as a reference spindle.

Therefore, the first spindle 12 of the first tool rest 17A.
The amount of movement between A and the second spindle 12B is calculated. As shown in FIG. 5 (b), the first tool rest 17A is driven to move the cutting edge of the tool 22A1 which is a standard tool onto the extension of the central axis of the first main spindle 12A. 1 turret 17
A is driven to move the cutting edge of the tool 22A1 onto the extension of the center axis of the second main spindle 12B, and this is the end point of the first turret 1.
The movement amounts XT and YT of 7A are stored in the tool post movement amount data storage unit 34 of FIG.

XT, YT and spindle distance data storage unit 3
An error ΔX in the distance between the main spindle distance set values XS and YS set to 3 and the second main spindle 12B with the first main spindle 12A as a reference,
ΔY and ΔZ are as shown in Equation 1. These ΔX and ΔY are
It is calculated by the correction data calculation unit 39 in FIG. 4, and ΔZ is set to 0 because the error is absorbed by adjusting the work end face to the cutting edge of the standard tool 22A1 when the spindles 12A and 12B chuck the works 15A and 15B. .

## EQU1 ## ΔX = XS-XT ΔY = YS-YT ΔZ = 0

Next, the correction value of the tool set data indicating the distance between the cutting edge of the standard tool 22A1 and the cutting edges of the other tools 22A2-22A4 is determined. As shown in FIG. 5 (c),
The work 15A is chucked on the first spindle 12A, and the center of the end face of the work 15A is set as the work origin 46. First
The tool rest 17A is driven to move the cutting edge of the standard tool 22A1 to the work origin point 46, which is the starting point, and the tool 22
The blade edges of A2, 22A3, 22A4 are sequentially moved to the work origin 46 of the work 15A, and this is set as the end point, and X at that time is set.
YZ movement amount, 40A2 (XT2, YT2, ZT2), 4
0A3 (XT3, YT3, ZT3), 40A4 (XT
4, YT4, ZT4) are stored in the tool set data storage unit 36.

On the other hand, a design value is set as the distance from the cutting edge of the standard tool 22A1 to the cutting edge of each of the tools 22A2 to 22A4 (XT ₀ 2, YT ₀ 2, ZT ₀ 2), (XT ₀ 3,
YT ₀ 3, ZT ₀ 3), (XT ₀ 4, YT ₀ 4, ZT ₀
4) Then, the difference between this and the movement amount stored in the tool set data storage unit 36 is obtained by the equations 2 to 5. The numbers 2 to 5 are calculated by the correction data calculation unit 39, and this value is the first tool post 17A for the first spindle 12A.
It is stored in the tool set correction data storage unit 37 as the correction value of the tool set.

[Formula 2] ΔX ₁ 1 = 0 ΔY ₁ 1 = 0 ΔZ ₁ 1 = 0

ΔX ₁ 2 = XT ₀ 2−XT 2 ΔY ₁ 2 = YT ₀ 2−YT 2 ΔZ ₁ 2 = ZT ₀ 2−ZT 2

## EQU00004 ## ΔX ₁ 3 = XT ₀ 3−XT 3 ΔY ₁ 3 = YT ₀ 3−YT 3 ΔZ ₁ 3 = ZT ₀ 3−ZT3

## EQU5 ## ΔX ₁ 4 = XT ₀ 4-XT 4 ΔY ₁ 4 = YT ₀ 4-YT 4 ΔZ ₁ 4 = ZT ₀ 4-ZT4

Next, the second main spindle 12B other than the first main spindle 12A
Calculate the correction value of the tool set for. A correction value of the spindle distance stored in the spindle distance correction data storage unit 35;
The first stored in the tool set correction data storage unit 37
The sum of the correction value of the tool set for the spindle 12A is calculated by the correction data calculation unit 39 by using the formulas 6 to 9, and this value is stored in the tool set correction data storage unit 37 as the correction value of the tool set of the second spindle 12B. To be done.

[Expression 6] ΔX ₂ 1 = 0 + ΔX = ΔX ΔY ₂ 1 = 0 + ΔY = ΔY ΔZ ₂ 1 = 0 + ΔZ = ΔZ

[Formula 7] ΔX ₂ 2 = ΔX ₁ 2 + ΔX ΔY ₂ 2 = ΔY ₁ 2 + ΔY ΔZ ₂ 2 = ΔZ ₁ 2 + ΔZ

[Formula 8] ΔX ₂ 3 = ΔX ₁ 3 + ΔX ΔY ₂ 3 = ΔY ₁ 3 + ΔY ΔZ ₂ 3 = ΔZ ₁ 3 + ΔZ

[Formula 9] ΔX ₂ 4 = ΔX ₁ 4 + ΔX ΔY ₂ 4 = ΔY ₁ 4 + ΔY ΔZ ₂ 4 = ΔZ ₁ 4 + ΔZ

Therefore, the tools 22A1 to 22A4 of the first tool rest 17A are attached to the work 15A gripped by the first spindle 12A.
When performing machining with the tool set correction data storage unit 3
The correction value of the tool set for the first spindle 12A stored in No. 7 is read, the selected tool is corrected, and machining is performed. Similarly, when the work 15B gripped by the second spindle 12B is processed by the tools 22A1 to 22A4 of the first tool post 17A, the tool set correction for the second spindle 12B stored in the tool set correction data storage 37 is performed in the same manner. The value is read out, the selected tool is corrected, and machining is performed.

As described above, the first spindle 12 which is the reference spindle.
By obtaining the correction value of the other tools 22A2 to 22A4 from the tool 22A1 which is the standard tool for A, the first
A tool set of the first tool rest 17A for the spindle 12A is obtained, and this operation only needs to be performed once. Then, for the tool set data of the other first tool rest 17A of the second spindle 12B, the correction value of the spindle distance stored in the spindle distance correction data storage unit 35 is added to the tool set data for the first spindle 12A. The work is simple and excellent in workability.

In the above embodiment, the first turret 17A has been described, but the tools 22B1 to 22B of the second turret 17B are used.
The tool set correction value of 4 is also calculated by the same method. Further, in this embodiment, there are two main shafts (first and second main shafts 12A and 12A).
Although the case of B) has been described, it goes without saying that the invention can be applied to the case where the number of main shafts is three or more. Further, in the above-mentioned embodiment, the tool set correction value is calculated by the incremental value such as the distance and the movement amount, but the incremental value can be obtained from the difference between the absolute values by the coordinate, and the tool set correction value can be calculated by the same method.

[0038]

According to the present invention, the tool set of the tool rest for the reference spindle can be obtained by obtaining the correction value of another tool from the standard tool for the reference spindle. The tool set data of the tool post of the spindle other than the reference spindle is obtained by adding the correction value of the tool post for the reference spindle to the tool set data for the reference spindle, so the tool set for each spindle is a very simple method. You can ask for data.

[Brief description of drawings]

FIG. 1 is a front perspective view showing an embodiment of an NC lathe to which the present invention is applied.

FIG. 2 is a basic configuration diagram of FIG.

FIG. 3 is an explanatory diagram showing an example of the processing steps of FIG. 1.

FIG. 4 is a control block diagram showing an embodiment of a numerical controller according to the present invention.

5A and 5B show an embodiment of a control method of the present invention, in which FIG. 5A is an explanatory diagram of distances of respective spindles, FIG. 5B is an explanatory diagram of movement amount of a tool rest relative to the respective spindles, and FIG. It is explanatory drawing of the tool set data of each tool of the turret with respect to FIG.

FIG. 6 is a basic configuration diagram showing an example of a conventional multi-axis automatic lathe.

[Explanation of symbols]

 12A, 12B 1st and 2nd spindles 15A, 15B Workpieces 17A, 17B 1st and 2nd turrets 22A1 to 22A4, 22B1 to 22B4 tools 33 Spindle distance data storage unit 34 Turret moving amount data storage unit 35 Spindle distance correction data Storage unit 36 Tool set data storage unit 37 Tool set correction data storage unit 39 Correction data calculation unit 42 Tool set setting data storage unit 46 Work origin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadahiro Iida 840 Shimotomi, Tokorozawa, Saitama Prefecture Citizen Watch Co., Ltd. Tokorozawa Office (72) Inventor Akihide Kanaya 840 Shimotomi, Tokorozawa, Saitama Prefecture Citizen Watch Co., Ltd. Tokorozawa Business In-house

Claims (3)

[Claims] 1. A plurality of main shafts having mutually parallel main shaft center lines and provided at predetermined intervals, and a plurality of main shafts that are rotatably supported independently of each other. A headstock and a Y-axis direction that is connected so as to be orthogonal to the X-axis direction that is orthogonal to the Z-axis direction that is parallel to the spindle axis, and that is orthogonal to the X-axis direction and orthogonal to each of the plurality of spindle centerlines. And at least one tool rest having a plurality of tools, and an axial feed means for moving the headstock and the tool rest so as to relatively approach and separate in the Z-axis direction, By moving the tool rest in a direction parallel to the Y-axis direction, it is possible to selectively position an arbitrary tool held by the tool rest at a machining position of the work held by the plurality of spindles, Numerically controlled by the coordinate system along the XY axes An NC lathe according to claim 1, wherein one of the plurality of spindles is set as a reference spindle, and a distance of a reference position of each spindle from a reference position of the reference spindle is set. One of the tools is defined as a standard tool, the cutting edge of this standard tool is moved from the reference position of the reference spindle to the reference position of each spindle, the amount of movement at that time is read, and the standard position of the reference spindle is read. The difference between the set distance of the reference position of each spindle and the movement amount of the standard tool from the reference spindle to each spindle is obtained as the correction value of the spindle distance for each spindle, and the correction value of the spindle distance and the reference spindle A method for controlling an NC lathe, wherein a sum of a correction value of a tool set error attached to a tool rest and a correction value of a tool set error for a spindle other than a reference spindle is obtained. 2. The method for controlling an NC lathe according to claim 1, wherein a correction value for a tool setting error with respect to a spindle other than the reference spindle is calculated from an absolute value based on coordinates. 3. A plurality of main shafts having mutually parallel main shaft center lines and provided at predetermined intervals, and a plurality of main shafts that are rotatably supported independently of each other. A headstock and a Y-axis direction that is connected so as to be orthogonal to the X-axis direction that is orthogonal to the Z-axis direction that is parallel to the spindle axis, and that is orthogonal to the X-axis direction and orthogonal to each of the plurality of spindle centerlines. And at least one tool rest having a plurality of tools, and an axial feed means for moving the headstock and the tool rest so as to relatively approach and separate in the Z-axis direction, By moving the tool rest in a direction parallel to the Y-axis direction, it is possible to selectively position an arbitrary tool held by the tool rest at a machining position of the work held by the plurality of spindles, Numerically controlled by the coordinate system along the XY axes NC lathe, wherein one of the plurality of spindles is set as a reference spindle, and spindle distance data is stored for storing the distances of the reference positions of the plurality of spindles in the XY directions from the reference position of the reference spindle. A storage amount and one of the plurality of tools of the tool post are defined as standard tools, and the movement amount when the cutting edge of this standard tool is moved from the reference position of the reference spindle to the reference position of each spindle. And a tool rest movement amount data storage unit that stores the distance of a reference position of each spindle from a reference position of the reference spindle stored in the spindle distance data storage unit, and the tool rest movement amount data storage unit. The spindle distance correction data storage unit that stores the difference between the movement amount when moving the standard tool from the reference spindle to each spindle, and the distance from the cutting edge of the standard tool of the tool tips of the tool post. Tool set setting data storage section to be set and A tool set data storage unit that stores the amount of movement when the cutting edge of the standard tool is moved to the reference position of the reference spindle by aligning the cutting edge of the reference spindle with the reference position of the reference spindle, and the tool set setting The difference between the data stored in the data storage section and the data stored in the tool set data storage section is calculated for each tool and stored as tool set correction data for the reference spindle, and also stored in the spindle distance correction data storage section. Tool set correction data storage unit for storing the sum of the stored data and the data for the reference spindle stored in the tool set correction data storage unit as a correction value for the error of the tool set with respect to a spindle other than the reference spindle, and the spindle. A spindle correction value stored in the distance correction data storage unit and a tool setting error correction value stored in the tool set correction data storage unit are calculated. NC, characterized in that it comprises a correction data calculation unit
Lathe control device.